Any satsuma is a PITA wait until they start making good fruit. I'd agree 10 years minimum for any satsuma variety in my actual experience. Best fruit I ever tasted
was on a 25+ year old owari tree planted in 1989 grown in sandy soil. I took buds from those trees and grew my own and got lousy, puffy, fruit for 5+ years.
"Too much N has been suggested but I don't believe I did that." I doubt that as well.
By former adviser to Alabama satsuma growers now at Texas A&M:
How to set lots of blooms for citrus fruit quality and thin skinned satsumas
Fertilize with Nitrogen according to tree age and crop load.
Fertilize early, well in advance of blooming
Protect foliage from winter damage to avoid leaf drop.
Prevent injury to foliage by Red Mites,etc.
Water trees diligently from budbreak through early fruit drop.
Fertility
Citrus are evergreen plants & relatively heavy nutrient consumers.
Nitrogen is main element of concern.
Applied annually
Split applications most efficient
Slow-release may be effective in some sites.
Soil & Leaf testing identifies need of other elements.
Collect current-season spring flush leaves in August for leaf analysis
Without testing, use complete fertilizer with minor nutrients
Nitrogen is key
For trees 7+ years old and healthy
Apply 1.0 to 1.5 pounds actual Nitrogen per tree per year
Divide into 2 or 3 doses
60%, 20%, 20%
Valentines Day
Mother’s Day
Father’s Day
In years with poor April Bloom or poor May fruit retention, skip applications 2 & 3.
Use granular fertilizer (no spikes). Broadcast under tree canopy. Water in with sprinklers or rainfall.
Summary of presentation:
satsuma tree must set a heavy crop of fruit for good quality
fertilize heavily according to the slide,1
5 year old tree 5-8 lbs 13-13-13 per year
fertilize 60% before bloom, water heavily
20% mothers day, 20% fathers day.
Satsuma fruit quality:
https://mrtexascitrus.weebly.com/citrusfruitquality.html